锰氧化物正极材料的低温焙烧制备及电化学性能

扫码查看

原文链接

万方数据
维普

中文摘要：以电解锰阳极泥(EMAM)为原料,利用焙烧活化法制备了水系锌离子电池(AZIBs)锰氧化物正极材料,通过 XRD、TGA、SEM 及电化学性能测试考察了氮气氛围下,不同焙烧温度(300、425、575℃)对锰氧化物正极材料的结构、形貌及电化学性能的影响.结果表明,氮气氛围下焙烧提高了锰氧化物正极材料的衍射峰强度和结晶度,材料呈现出片状和颗粒状形态,团聚现象减少,空隙增加;随着焙烧温度的提高,锰氧化物正极材料物相逐渐从α-MnO2转变为Mn2O3与Mn3O4;焙烧使锰氧化物正极材料的首次放电比容量、倍率性能和循环性能得到提升,材料具有较小的瓦尔堡系数和更快的Zn2+扩散速度.其中,焙烧温度300℃制备的锰氧化物正极材料(300-EMAM)表现出更好的电化学性能,在5 C倍率下,300-EMAM的初始放电比容量为232 mA·h/g,循环100圈后仍能保持190 mA·h/g的放电比容量;300-EMAM电极具有较低的接触电阻(33.6 Ω)和电荷转移电阻(816.3 Ω).

外文标题：Low-temperature roasting preparation and electrochemical properties of manganese oxide cathode materials

外文摘要：Aqueous zinc-ion batteries(AZIBs)manganese oxide cathode materials were prepared from electrolytic manganese anode mud(EMAM)by roasting activation method,and the effects of different roasting temperatures(300,425 and 575℃)on the structure,morphology and electrochemical properties of manganese oxide cathode materials under nitrogen atmosphere were investigated by XRD,TGA,SEM,and electrochemical performance tests.The results showed that the diffraction peak strength and crystallinity of manganese oxide cathode materials were improved by roasting under nitrogen atmosphere,and the materials exhibited morphology of flakes and particles,with the agglomeration phenomenon reduced and the voids increased.The structure of the manganese oxide cathode materials was gradually transformed from α-MnO2 to Mn2O3 and Mn3O4 along with the increase of the roasting temperature.Calcination improved the initial discharge specific capacity,rate performance and cycle performance of manganese oxide cathode material,with the material showing a smaller Warburg coefficient and a faster diffusion rate of Zn2+.The manganese oxide cathode material(300-EMAM)prepared at roasting temperature of 300℃showed better electrochemical performance,with an initial discharge specific capacity of 232 mA·h/g at 5 C,that of 190 mA·h/g maintained after 100 cycles,and the 300-EMAM electrode exhibiting a lower contact resistance(33.6 Ω)and charge transfer resistance(816.3 Ω).

外文关键词：

aqueous zinc ion batteriescathode materialsmanganese dioxideelectrolytic manganese anode mudfunctional materials

作者：

刘宝成、陈思含、黄燕、熊利芝、向延鸿

展开 >

作者单位：

吉首大学物理与机电工程学院,湖南吉首 416000

吉首大学药学学院,湖南吉首 416000

关键词：

水系锌离子电池正极材料二氧化锰电解锰阳极泥功能材料

基金：

国家自然科学基金项目国家自然科学基金项目国家自然科学基金项目国家自然科学基金项目湖南省青年科技人才项目湖南省优秀青年基金项目湖南省优秀青年基金项目

项目编号：

522640375206401452265019520640132022RC10872023JJ100332022JJ40341

出版年：

2024

DOI：

10.13550/j.jxhg.20230873

精细化工

大连化工研究院设计院中国化工学会精细化工专业委员会辽宁省化工研究院

精细化工

CSTPCD北大核心

影响因子：0.557

ISSN：1003-5214

年,卷(期)：2024.41(9)